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            "title": "Swap Salary",
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            "content": "<p>Table: <code>Salary</code></p>\n\n<pre>\n+-------------+----------+\n| Column Name | Type     |\n+-------------+----------+\n| id          | int      |\n| name        | varchar  |\n| sex         | ENUM     |\n| salary      | int      |\n+-------------+----------+\nid is the primary key for this table.\nThe sex column is ENUM value of type (&#39;m&#39;, &#39;f&#39;).\nThe table contains information about an employee.\n</pre>\n\n<p>&nbsp;</p>\n\n<p>Write an SQL query to swap all <code>&#39;f&#39;</code> and <code>&#39;m&#39;</code> values (i.e., change all <code>&#39;f&#39;</code> values to <code>&#39;m&#39;</code> and vice versa) with a <strong>single update statement</strong> and no intermediate temporary tables.</p>\n\n<p>Note that you must write a single update statement, <strong>do not</strong> write any select statement for this problem.</p>\n\n<p>The query result format is in the following example.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> \nSalary table:\n+----+------+-----+--------+\n| id | name | sex | salary |\n+----+------+-----+--------+\n| 1  | A    | m   | 2500   |\n| 2  | B    | f   | 1500   |\n| 3  | C    | m   | 5500   |\n| 4  | D    | f   | 500    |\n+----+------+-----+--------+\n<strong>Output:</strong> \n+----+------+-----+--------+\n| id | name | sex | salary |\n+----+------+-----+--------+\n| 1  | A    | f   | 2500   |\n| 2  | B    | m   | 1500   |\n| 3  | C    | f   | 5500   |\n| 4  | D    | m   | 500    |\n+----+------+-----+--------+\n<strong>Explanation:</strong> \n(1, A) and (3, C) were changed from &#39;m&#39; to &#39;f&#39;.\n(2, B) and (4, D) were changed from &#39;f&#39; to &#39;m&#39;.\n</pre>\n",
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            "sampleTestCase": "{\"headers\":{\"Salary\":[\"id\",\"name\",\"sex\",\"salary\"]},\"rows\":{\"Salary\":[[1,\"A\",\"m\",2500],[2,\"B\",\"f\",1500],[3,\"C\",\"m\",5500],[4,\"D\",\"f\",500]]}}",
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                "insert into Salary (id, name, sex, salary) values ('1', 'A', 'm', '2500')",
                "insert into Salary (id, name, sex, salary) values ('2', 'B', 'f', '1500')",
                "insert into Salary (id, name, sex, salary) values ('3', 'C', 'm', '5500')",
                "insert into Salary (id, name, sex, salary) values ('4', 'D', 'f', '500')"
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